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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4704ce589d0e422676b871caa8078c69522c6a9eace57cd118e0240b4eedd284' 
  AND token = 'gnEQ1lMP/0jUComOyZ5UzJGZ6V2V7JdoOJwPuDEa+BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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