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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8590c840c2f2a7a3e3b95468c7e449e8efcbc22e63571bf416bcfdcb20a9c2a3' 
  AND token = 'lKaJ5fMBouI5J9kW+A6hy6LUsLtJrrEnsJcDZQt5JiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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