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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c35413790048dc18603faede611c35abe27c38a2aed175c574b58215668032' 
  AND token = 'bldX4mMUO0B/VZTghBJBH/Wbt1C3TQ+VQIdQ/5nq97U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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