SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd32fd2385e463582d5cf119b49ef60471ad2c4b0c692bcfcc56d59c8e011839' 
  AND token = 'ZVX1JUaJgVf9Ylii9KSYW9LAqRERGbBO0uary+w0VCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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