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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af8b60275e3c294b96e4a53a882b26eb49d4285933a6a10b04e3f1641398382' 
  AND token = '/IaCBVd66ZZgKRHYWxaZGbz9G8PfDw3mgEdQ773RN3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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