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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f00c995618f39df76cc51ea4588ed1729a4ba734e29093fd099de1ea99844a41' 
  AND token = 'QIl7CMWv5lliKReGl9W6nSHTm1MuwcG6AIlGIxhWAKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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