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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991489cd3815001a8a63acd361340f11400bac6a8663001e5611e07801242d1f' 
  AND token = 'dXjAFSt3B/mPy0tBlcrGa9b45fj1g+x1yAYbiE8nffU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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