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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '787b6dedef1de03dfd53b12f93176b8c189927ae98f84005810fb7a5e746121f' 
  AND token = 'ynAwO6iRqpMOLhi6FIDN6PI7pqaiZx6qByFIG2FVvSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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