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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '854680ae1eb4f6bfc320bbb6e27ae1e0fa10508b4e26deb091b835bbf46cf217' 
  AND token = 'TFYD6iXK7YgoWk4uOQclPqjjd698AiPAWGtW/xY+sJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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