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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a170539728c65f1cc82a4be820d80763ff349c6ecf7182bdd716025746f56a74' 
  AND token = 'Ko6GLZMmrWtzrmaUNxg/1zIoWDczujX1/c4LuhaoCm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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