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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c790bcd610277c2129f0825b50475c331a94255c205b3cdc84e6a44c56b314b1' 
  AND token = '8yilaRqqDEa9dX9ANQXLqOGspJyI/i0oiD3+5AB2ew4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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