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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deea1cedeab3842bf0406d6c5a6a22ae6f62657bfbb38fc2a1630b8b8ea97ee8' 
  AND token = 'oKzx8SNjVolgFOOqQgfwGV9DdaqzmjzaZGZoppT3sYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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