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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c353bb5a393321b1829ac00c8bca1ba01c15910b75b12d5701dd823383119a25' 
  AND token = 'o6Wjn32EFMzO1kYjz8I5CZISRrS+ouYZRr53m7/pBso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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