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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6730d8bd76cc2c86d9360459622aa845089a57573636c2618fc1507b8b8ba1' 
  AND token = 'eSi92PUGGg98U5SbmGrfMkjec3OmTjhQq29evUzfOGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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