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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8737f8f97fd3c82918ff230d94f6a3c514003f223de655e5dc4a9145af3fc42c' 
  AND token = 'sx3M4ZM0rxMF9xGpWWZQkFj55dd8W0UhzNaDtQGNHEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}