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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c562963455317d8206cbecb147caa1d0ff6c1d4ce4a50a0595810922f25d5a9b' 
  AND token = 'kmstAsxBLGvz8wPbb2RGiYlrq8W408xD5LvlRa8HgUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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