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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd31af05cada932fdc5ec34be4197c846bf5b9c6379f4bd0d9eb027c54e44b1' 
  AND token = 'BKIwHSZocSYZeg5U0ncSGubJClo8dEz/ecmo0vFzM2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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