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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013c0bb9ef9f782c040e907fb787f24c388f8b2cb1c348397038139a06fb9bfb' 
  AND token = '3AzO/HhgZ1IdwtcMCia6Zfhj269ZRa26u9X4Qcg9S4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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