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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1cf92734f12001677e1f817f29177bd184786b6d1537a1fdbc501fb2362be3' 
  AND token = 'fOSs3Huf+T7U3xOOv2jx6q9EdckHJthmd64DuEz9VOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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