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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a2bc86aab008b7aacbc925d21c6ff00c0c939eca8bf57cd752d71b8ed5a88bb' 
  AND token = 'OjcGNi9oFxQj22KP3OOeXG7IH7MvlyhkCiqBumRUHps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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