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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d93f9f36862c0b908779291d1b5a29dccd1924c0ecb58452c3934eaa47af7c0' 
  AND token = '1oGtq72/vLtjpJgv1g2Bt4IaIMyCQmNEuhLSLgCUt6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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