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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707b5c4546f1d7430a6ddca9d080e4a062b0020b3f930172b4f1e19b5558fee4' 
  AND token = 'jRiJkUra3+aGpPkSTXckFUGW6QwMuyF1Sc4MjqZDnyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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