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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597cec44df76f311f52b4d9cc304c7c878d625ae977d47f489088a1b969995c6' 
  AND token = '61IY7Hc619V/09lnIf1IqakABbR0k3NTD1+XgnSxMA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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