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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a65ba8253cbe9b6f250512bb01bc8fa69e8f6c7d15cf8878bac06d82d578860' 
  AND token = 'MYZ9zTardgIOozinx6aGExlQc02AT5UiW4y8PTci99Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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