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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb9e00b1e59dc172c1362e043401af084eb97240264f33b98146df5f9ab74dd' 
  AND token = 'xHQWWnZnVDW3ITLwq8n+LE6twgrz6kfYl+0jHgIeB70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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