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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f43b38aeb7c2984c4ad82cf755a52296b9fe8c35995affc3a0695bbff52ad2' 
  AND token = 'wShm7GPeA//nE8WAUZw/O6obASrdzCCc5UJec+FooBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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