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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61c8b2e8d6546c900cb1f1b8d52c01bcea4bb4f5b5a3b4c2efea5899f10cf22' 
  AND token = 'doiUkBsUgcGGfj1BV1FUJxdaWulQxSlJDw3cqW2nE9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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