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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a72c4274e452da191f0a24b322476835d599c4c18458db026fe30c0e7124fe' 
  AND token = 'VXlhXnvW7pPGoN+MMOXZT2122h7Hj1WZfjmzqsHlXRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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