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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695eceef870bb6a8c92ae4fc189ab98f2f71a0b9c5d90fd4bac67fdbf5fe5912' 
  AND token = '5GfD3Lth5Tsfs2ZH/MQa+gVpfPDuRqhR4dLi/6xi90M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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