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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e083fb3ecd056f5cd70205d9d19ba6f6131d01dfc145bf7e0bfb50aba58709' 
  AND token = '7ABRsbacXoOKeH8bxzSF0hVOiNaDPU5q+S0xXQvuIiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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