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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc23516e46d5b66fc67f8e76200e07ae7bfe528338023164a1d4d24c16dea00e' 
  AND token = '9oiSwRBbE8RM/41PvZF3S15RyKqkWWZDkWLKCItJ7Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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