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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1a0150301a4d35d80722ff392f93386787f131c4339ab0e9cfce5dd037713a5' 
  AND token = 'UjvG3mZB5QciIa4lxTtntEvy7JCvk2CScKUMp0qqHgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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