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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055ce11d2dc2c455fb2fedfdf6ff8fd6f23e701a55b71d36890c9a6948ed1dfd' 
  AND token = '9MeNW59k7j+v7DIrAz+2Yq9Vhearkc8m3dylJelM89Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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