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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994fdd26c00f8de17e2b147dbfce2f0f4c9b3acffa35de30efbe5fe6de1a4ba6' 
  AND token = 'MmlrbbcfmtnhyZBtgUZ9ME47CisrZq7K3qAOrj7c3tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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