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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0303b933c7187f8e4455a66ed345137b6861bf07110cb815e5de95c1ed21fa' 
  AND token = 'OriyzHhWlC5tH0QM3vH4Hal2RTw+Xpvh14B+oRLbq+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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