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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a6365c1493a5b43d225acf3cca7e095a890ffdd7858df512438ee3d7af57cb' 
  AND token = 'Tsq/1HhJEQb07hTHK6C9vflPJLX9mboUT6omT5C7RkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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