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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ae32e7bd7402040bbd27a8b094a75526aa1703e2346d27217e3ab11b831b850' 
  AND token = 'NrnOWniXdaAKlzrKljAYxXyNGHpLO2P/lpyQMWfj46Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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