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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea8556d032a01056b4e1aea4fb5ae8530274ddb19630eea5cc7f40e1c364bcb' 
  AND token = 'y/0y+HiUV/PzOLnZ8frtmtsBjUsbGZwD7cy6Q5UGG1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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