Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '864cbc380097449612c069e0e380bdc6ce7e16162f477d1dad7890e5760c5724' 
  AND token = 'hbmT+YY56dNPAwMuUHpwRTX77dDciur3hvfhDa75xn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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