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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8895e67f12e551b75ce9f1b8dbe8566dc03a02d68734869d0cf2bd47f99ab5b5' 
  AND token = 'adPXZp/+nNF15WZQRB+EiCT/bXltjIEYbFH54YkZFu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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