SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12da474c58f5be4a7f163a7efc4d1977a62f27f0d7343947ec31249a42059dd7' 
  AND token = 'aVUKqRXgPtsFXgo6cn31Butq4FwLg88W8MwnVz+ebYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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