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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab2cf2c3b6ed3695b6de3fcbb3e90a6ef964f2cbf8f2bf8ec96fd1ea48cb4bb1' 
  AND token = 'GudpJnQ+zsoQpyY8FpQ4ZngfsMzWlNscmqB9teSUdqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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