SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1a6397a6f27c2a3e65f76facb54f4f527d80c844152d41034956688691fc10d' 
  AND token = 'om2ZvpGigPqghpa6PhBJW/471eR+z4iagnt2O8avijw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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