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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5bf219034b01a1393d78cbe468b1a61e44588f5efe4f79f306a33057a1635af' 
  AND token = '1LZTo87h/a6l6FF+7IJ00hidGXTT0wjXwOEP0CB0L0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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