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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd735bd0733f5d6e9ddfc17b90a1e1e5a4fcae3b18d0ee21d7b9502f356e2ab' 
  AND token = 'C1ca1VI9H0MjZV+92GNzD64MlR2HHNm6vAbnaZQlCY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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