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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0620ea9414cd67b75ea46466b6fed1755db75a58e7509be3813a0d5b98437d6' 
  AND token = '4Wjy/YgLxdxsUp2b7JZDZ4d1f/XW3AdPutwa9u9PaPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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