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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c875d0a6e887feeff7137a3b7fbdfdceb93f91e1dea18d076d3a6fa34f570b66' 
  AND token = 'bmXcHjnQXLw84bU6UOMyKzmijv4hMDI0eL8Woo3micU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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