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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e2fa1f6c32d9c2206203809c5886a7060de0f8c14ff4ac47cf6b22acc3a10a' 
  AND token = 'p0aDy/CBdCy6Fd9M8ZfpMjsILMlYOX8Xr6P9sp9cYyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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