SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c2a795a783ded0ae7c9386819c36bdf9fcbc00cad47ed8501864b2842369a4' 
  AND token = 'Cbg3UB52iwuIUgZHEfF5NHUvj+ScKuJMGhsbc8sfpfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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