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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62bcb4b9b098e8b9213e448f0b8ab7650fa35f3c140529d88c41bf588651f5d' 
  AND token = 'XK/siU6VcjSBBXIiVVEgQyfXg2J3dMMgPeD36GKCBSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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