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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcfc7e5b63d17ef8f0db091d04fdc7bb8aca06f947f0723cc7db790f185df6b' 
  AND token = '/jvDQ0XfeIe0JpxyAQWWsqMFCj18yVH/85A97BN0lm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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