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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e39c94efa3a4a9e73ce36ea35adc3827737bd419567321cd2480f9022814e90f' 
  AND token = 'Mj8Pqeq3E7w2UrqZkLcKBW5L1etMQcEoS4smoxi9G5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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