SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42e6b0517f6e1235b223f5dcd825672c85b0e0c108aea24a4d0bc19ea8a4266e' 
  AND token = 'JaW9OuZOEsaU/yvwCOmGqgh71DuLPY3nErQ8JPYwpAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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