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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a47e42e9088618540787db6f1c57248dc146bb55e054368076e3d3705fdb1cf' 
  AND token = '9VNIZQRn+ACNxpsmMCaHfJPX5w1dXe0Tr51MuYygqKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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