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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cf00336d2b038b7acd9c9b6d45a4ed0bd7d6d4b69389c4b46fd829d21855ab' 
  AND token = 'jmozCjy0zWdZOwFZ9EIGmUOvd9AsqIm10tudTV2Jc9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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