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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ace9adecc17b16852f91d36a85c8697a4a15f10d44f5e6e1f0fa22f4970d22b2' 
  AND token = 'A5wQ4rxhx++uNKF2XBpgWY0NqY52Itxa/viS7+tQhYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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