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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13eeee24702d1edfbee2d59be574b0a7e76deb7c62cbe9b05c9b4df0f89ad304' 
  AND token = '/GOdDKIwSx8CuknsTueVIO1zaHq1iUitlQcVt0Uy7H0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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