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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffe7c244c5cce430d8b3d091f7bf62a3b99328c52b7be54bd5aefd9bb5608fb' 
  AND token = 'P6/7q28ydGqDgqoYLFmBYgabdWIbTMsZkiPZmShLhTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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