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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1473c2e42e3aaea27bb822e8807c58b81020ccf240034922ac67234d15b560a6' 
  AND token = 'd8RSTb8D5cLIl8bgTuA11ZIgNbxNewkSP7L2WDOta3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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