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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebaf321c5aab72b4b73305e5d031485ea5da37549e0ada85d7bfc3bf63f5cf15' 
  AND token = 'mOMXiM+oaVSsTYLVOHzT+HhjCqM7W0zZXcMNFTVZorg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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