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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f435609372edcf8308ce56ddaf5dd6c1b1e7ad5af18cb4933511cd64b933e33' 
  AND token = '0JhE5xftT2fwkVxESNCn4np/kJJWZmYekvGks7JjBuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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