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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2fb9ca8ed820cf8e3d58a66a9b8c952c25f0988a8ffd68754608697fade813' 
  AND token = 'eFkBax8HN/IIjmZUNMNuBtgbC9U5VrLBCViN9MTRwJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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