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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6caf20a0ce4bf1228c448444fe30ff5260a6238bbf1414e1dc7bf1cad1d4b860' 
  AND token = 'd5gDj8Ah5jRPobo+b1T+XBwVEM04/O1TxOXpwGh2HfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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