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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad771768ba36a8cc4c8d568b8edea4e46f6680a7fdca919dcea5be40a94519db' 
  AND token = 'xPgk8JGd5CXF5RlAwy9p6y8TsgyNMMRJB3Czid+fZIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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