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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744573d52577b647a691a39c7b0cd197602a6a7719738b43b9c9ab3429fc4e80' 
  AND token = 'hbqnU0Tb+2DsIcbFKFHZfFZDWojFHhpmGxncupYbhBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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