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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa446c44c693c156f101b8b0ed8d1e1c99691076805dfc39fd55b7d0d55b5d6' 
  AND token = '7IOU6BjuEdgVvgeOJ19BYVpLtXDOBm091DRgCg0ovX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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