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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddd60b9424fcab21b37106fc6ef7e76fa0b5c829e17ef5b42d66a1d90551a9c2' 
  AND token = 'lnh4vt8yzNAD/P9ay+I5H1arAy8bTII8HUKuyZnktb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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