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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dd24c0437573a45f2ff0a3d39eafa2fdd300ee87473fd3f780f285ce71661bc' 
  AND token = 'TtAXYVFqkrRfusdya89NZ6Fyk0quRAxlCukq2w6/Bo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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