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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd2204f81f23922bd021bdc048810a5c687b3864db0b86f184b88965b6550b5' 
  AND token = '7WAvg5GtMcZzlAkQQnYOLu5rSeIocSajyGpWjco6Cpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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