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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360ef8b189abeab1fd02ee9c67555cacd126ad3e839e5eecd6ec2cd965f4186a' 
  AND token = 'yR8rNEgFsd5TKfcfCmG6QkeUsKQ676SJzs27tYl3MfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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